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Three New Turonian Muricacean Gastropods from the Santa Ana Mountains, Southern California

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Three New Turonian Muricacean Gastropods from the Santa Ana Mountains, Southern California THE VELIGER © CMS, Inc., 1996 The Veliger 39(2):125-135 (April 1, 1996) Three New Turonian Muricacean Gastropods from the Santa Ana Mountains, Southern California by L. R. SAUL Invertebrate Paleontology, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA Abstract. Three new species of Praesargana, P. argentea, P. confraga, and P. kennedyi, are the first sarganines reported from southern California. These rare muricacean gastropods of late Turonian age occur in the Baker Canyon Sandstone Member and the overlying lower part of the Holz Shale Member of the Ladd Formation in the Santa Ana Mountains, Orange County, California. Inclusion of P. argentea and P. kennedyi in Praesargana broadens the concept of the genus to include species that have spiny sculpture, and species that lack a strong axial component to the sculpture. One species of Praesargana, P. condoni (White, 1889), was previously known from the Turonian of northern California. This threefold increase in diversity in a more southern fauna suggests that Praesargana may be indicative of a warm- temperate to tropical climate. Sarganinae resemble predaceous Muricidae rather than ciliary-feeding Trichotropidae, but have a fold on the columella and a protoconch more like that of Pyropsinae. For these reasons, despite recent assignments to other families, Sarganinae are included in the family Tudiclidae of the Muricacea. INTRODUCTION About 35 calices are present on the fragment, which pos- sibly used a gastropod shell as substrate. Corals are rare Although gastropods of Cretaceous age from the Santa in Pacific Slope Late Cretaceous deposits, and colonial Ana Mountains, Orange County, California, have been corals even rarer. If this was a hermatypic coral, it suggests described in several papers (e.g., Packard, 1992; Popenoe, clear, normal salinity water above 18°C at a site of low 1937; Saul & Popenoe, 1993), the faunas are incompletely sedimentation in water less than 50 m deep (Wells, 1956: known. This paper describes three new muricacean species F353). If the specimen was not transported downslope, it of late Turonian age from the Baker Canyon Sandstone suggests a probable depth limit for these faunas. Member and the overlying lower part of the Holz Shale These three new species have apertural features char- Member of the Ladd Formation. Figure 1 plots the lo- acteristic of the Late Cretaceous muricacean subfamily calities at which these species have been found on a geologic Sarganinae Stephenson, 1923. At present the subfamily map. comprises only Sargana Stephenson 1923, and Praesargana At least 38 other molluscan taxa are present at the 10 Saul & Popenoe, 1993, and each genus contains but few localities that yielded these new species (Table 1). The species. Additionally, Rapana tuberculosa Stoliczka, 1867, ammonite Subprionocyclus sp. indicates a late Turonian from near Serdamungalum, southern India may be a sar- age for these deposits (Matsumoto, 1959, 1960). Most of ganine. In the illustrations and description of R. tuberculosa these fossiliferous beds may be storm deposits, but, at USGS from the Trichinopoly Group of Turonian-Coniacian age loc. 2759, specimens of Anchura (Helicaulax) tricosa Saul (Acharyya & Lahiri, 1991), the description of the very & Popenoe, 1993, with elongate outer lip and rostral ex- narrow anterior siphonal canal is especially suggestive of tensions preserved, suggest that these shells could not have Sarganinae. According to Stoliczka (1867:156), the de- undergone much transport or reworking by wave action. scription of this species was prepared before the specimen Saul (1982) considered the mollusks of these assemblages accidentally fell into acid, and the illustration was drawn to have lived from the sublittoral to depths not greater than after the spines had been partially etched away. Petuch 40 m. At LACMIP 16644 the impression of a fragment (1988:12) has suggested that Ecphora proquadricostata (roughly 2 cm x 0.7 cm) of a coral colony was found. Wade, 1917, should be placed in an as yet unnamed sub- Page 126 The Veliger, Vol. 39, No. 2 & = fossil locality QUATERNARY a = CIT 1292 Qac = g = CIT 1891 & UCLA4235 Alluvium&colluvium Qt = USGS 2759 Terrace deposits Q = CIT 80 § = CIT 82 TERTIARY g = LACMIP 16645 Ts = ^ = LACMIP 16644 Sespe Formation Tsa = @ = CIT 454 Santiago Formation <D = CIT 1064 Tsi = Silverado Formation CRETACEOUS Williams Formation Kwp = Pleasants Sandstone Member KWS = Schultz Ranch Member Ladd Formation Klh = Holz Shale Member Klhsc = Sandstone & con- glomerate lenses within Holz Klb = Baker Canyon Member Kt = Trabuco Formation JURASSIC Jsp = Santiago Peak Volcanics JbC = Bedford Canyon Formation SCALE 1:48,000 1 2 Miles 2 Kilometers Figure 1 Geologic map of a portion of the northern Santa Ana Mountains, Orange County (after Morton, Miller, and Fife, 1973), with localities yielding specimens of Praesargana species. Map includes parts of Black Star Canyon (1967), Corona South (1967), El Toro (1968), and Santiago Peak (1954) USGS 7 Vz-minute quadrangles. L. R. Saul, 1996 Page 127 Table 1 List of species associated with three Praesargana n. sp. Localities yielding Praesargana spp. are listed left to right in ascending stratigraphic order and toward deeper water deposits. Of the three species, P. kennedyi seems to have lived on shallowest bottoms and nearest to shore. Praesargana argentea and P. confraga are both associated with Anchura (HP) tricosa in moderate depth shelfal assemblages that include ammonites. (See Saul, 1982, for listings of shallower and deeper water Santa Ana Mountains Cretaceous faunas). Map Number Biota associated with Locality 1 4 3 5 2 2 8 7 6 9 Praesargana spp. number 1292 80 2759 82 4235 1891 454 16644 16645 1064 Trigonarca californica Packard, 1922 • • • • B Pinna calamitoides Shumard, 1859 • • B Lima beta Popenoe, 1937 • A • A B Alleinacin sulcata (Packard, 1922) A • B Ambocardia delta (Popenoe, 1937) • • • B Callistalox arata (Gabb, 1864) • • • B "Aporrhais" vetus Packard, 1922 • • G Ampullina pseudoalveata (Packard, 1922) • • • • • • ? G Gyrodes dowelli White, 1859 • • G Praesargana kennedyi, sp. nov. * • • G Varens formosus Saul & Popenoe, 1993 • • • • G Glycymeris pacificus (Anderson, 1902) • • A • B Pterotrigonia klamathonia (Anderson, 1958) • A • • B Crassatella gamma Popenoe, 1937 • • B Paraesa? zeta (Popenoe, 1937) A B Liopistha anaana (Anderson, 1902) • B Latiala nodosa (Packard, 1922) • A • • • G Anchura (Helicaulax) tricosa Saul & Popenoe, 1993 A A • • A • • • G Praesargana argentea, sp. nov. • • • • G Cucullaea (Idonearca) gravida (Gabb, 1864) • • • • B Tenea inflata (Gabb, 1864) small var. A A B Corbula sp. • • • B Turritella hearni Merriam, 1941 A ? G Varens anae Saul & Popenoe, 1993 • G Praesargana confraga, sp. nov. • • • G pycnodontid A A A B Pachycardium coronaense (Packard, 1922) • • • B Calva regina Popenoe, 1937 • • B ?Atira sp. • • G Sciponoceras sp. C Subprionocyclus sp. C Inoceramus sp. • B Neophylloceras sp. C Cyprimeria moorei Popenoe, 1937 • B Aporrhais n. sp. • • G Carota dilleri (White, 1889) • G Biplica cf. B. isoplicata Popenoe, 1957 • G Ellipsoscapha ? sp. • G Eutrephoceras sp. • C pachydiscid ammonite C colonial coral • Indogrammatodon sp. • B Turritella iota Popenoe, 1937 • G Arrhoges sp. nov. • G • = abundant; • = common; • = rare; = Praesargana spp., all are rare; it = ammonite, all are rare; B = Bivalvia; C = Cephalopoda; G = Gastropoda. genus of Sargana, but E. proquadricostata has an internally Sargana has been recorded from the Senonian of Pon- denticulate outer lip and a moderately wide siphonal canal. doland, South Africa, and the Campanian-Maastrichtian It lacks a columellar fold and a posterior notch at the of the Gulf and Atlantic Coasts of North America. Prae- suture. sargana was previously known from P. condoni (White, Page 128 The Veliger, Vol. 39, No. 2 Table 2 Characteristics of Tudiclidae, Tudiclinae, Pyropsinae, and Sarganinae. Tudiclidae Tudiclinae Pyropsinae Sarganinae Shell Shape and Size Rapiform or pyriform, small Medium to large size, with Medium to large size, with Small to medium size, with to large size, commonly moderate to long anterior moderate to long, tapering short to moderately long with moderate to long an- siphonal neck anterior siphonal neck anterior siphonal neck, terior siphonal neck bent back to left, forming wide to moderte umbilicus Whorl Shape Angulate, biangulate, or Angulate or biangulate with Angulate to rounded, abrupt- Angulate or subangulate, rounded abrupt basal constriction ly to smoothly constricted abruptly to smoothly con- basally stricted basally Anterior Canal Commonly long Long and narrow, nearly Moderate to long, more or Short to moderately long, straight less narrow, nearly very narrow straight Protoconch Paucispiral, low Low to papillate in earlier Low to nearly flattened Low to flat species becoming bulbous in late species Aperture Rounded, commonly nearly Rounded, nearly as wide as Rounded to elongate, ex- Rounded, nearly as wide as as wide as high, commonly high, inside of outer lip panded, commonly suban- high, some with angulation subangulate at shoulder Urate or smooth gulate at shoulder at shoulder Columellar Fold One fold or swelling at en- One fold at entrance to si- One fold or swelling at en- One fold at entrance to si- trance to siphonal canal or phonal canal; inner lip trance to siphonal canal or phonal canal opposite pro- no fold wraps over fold leaving no fold; inner lip wraps jecting tubercle on inside umbilical chink over fold
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